Mr Effmert and another crew member were captured but two other men died.

The aircraft, nicknamed the flying pencil, is said to be largely intact with its main undercarriage tyres inflated and its propellers showing crash damage.

Air Vice-Marshal Peter Dye, director general of the RAF Museum, said: "The discovery of the Dornier is of national and international importance.

"The aircraft is a unique and unprecedented survivor from the Battle of Britain.

The twin-engined German wartime bomber is said to be largely intact"It is particularly significant because, as a bomber, it formed the heart of the Luftwaffe assault and the subsequent Blitz."

He added: "The Dornier will provide an evocative and moving exhibit that will allow the museum to present the wider story of the Battle of Britain and highlight the sacrifices made by the young men of both air forces and from many nations."

Work to prepare the Dornier for display at the Battle of Britain Beacon project will be carried out at the RAF Museum's conservation centre in Cosford, Shropshire.

The museum, with the support of English Heritage and the Ministry of Defence, is drawing up a plan to recover the aircraft.